
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />

    <title>dis — Disassembler for Python bytecode &#8212; Python 3.9.6 documentation</title>
    <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" />
    <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
    <script type="text/javascript" src="../_static/jquery.js"></script>
    <script type="text/javascript" src="../_static/underscore.js"></script>
    <script type="text/javascript" src="../_static/doctools.js"></script>
    <script type="text/javascript" src="../_static/language_data.js"></script>
    
    <script type="text/javascript" src="../_static/sidebar.js"></script>
    
    <link rel="search" type="application/opensearchdescription+xml"
          title="Search within Python 3.9.6 documentation"
          href="../_static/opensearch.xml"/>
    <link rel="author" title="About these documents" href="../about.html" />
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
    <link rel="copyright" title="Copyright" href="../copyright.html" />
    <link rel="next" title="pickletools — Tools for pickle developers" href="pickletools.html" />
    <link rel="prev" title="compileall — Byte-compile Python libraries" href="compileall.html" />
    <link rel="canonical" href="https://docs.python.org/3/library/dis.html" />
    
      
      
    

    
    <style>
      @media only screen {
        table.full-width-table {
            width: 100%;
        }
      }
    </style>

    <link rel="shortcut icon" type="image/png" href="../_static/py.png" />
    
    <script type="text/javascript" src="../_static/copybutton.js"></script>
    
     


  </head><body>
  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="pickletools.html" title="pickletools — Tools for pickle developers"
             accesskey="N">next</a> |</li>
        <li class="right" >
          <a href="compileall.html" title="compileall — Byte-compile Python libraries"
             accesskey="P">previous</a> |</li>

    <li><img src="../_static/py.png" alt=""
             style="vertical-align: middle; margin-top: -1px"/></li>
    <li><a href="https://www.python.org/">Python</a> &#187;</li>
    

    <li>
      <a href="../index.html">3.9.6 Documentation</a> &#187;
    </li>

          <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="language.html" accesskey="U">Python Language Services</a> &#187;</li>
    <li class="right">
        

    <div class="inline-search" style="display: none" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="Quick search" type="text" name="q" />
          <input type="submit" value="Go" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
    <script type="text/javascript">$('.inline-search').show(0);</script>
         |
    </li>

      </ul>
    </div>    

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body" role="main">
            
  <section id="module-dis">
<span id="dis-disassembler-for-python-bytecode"></span><h1><a class="reference internal" href="#module-dis" title="dis: Disassembler for Python bytecode."><code class="xref py py-mod docutils literal notranslate"><span class="pre">dis</span></code></a> — Disassembler for Python bytecode<a class="headerlink" href="#module-dis" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.9/Lib/dis.py">Lib/dis.py</a></p>
<hr class="docutils" />
<p>The <a class="reference internal" href="#module-dis" title="dis: Disassembler for Python bytecode."><code class="xref py py-mod docutils literal notranslate"><span class="pre">dis</span></code></a> module supports the analysis of CPython <a class="reference internal" href="../glossary.html#term-bytecode"><span class="xref std std-term">bytecode</span></a> by
disassembling it. The CPython bytecode which this module takes as an input is
defined in the file <code class="file docutils literal notranslate"><span class="pre">Include/opcode.h</span></code> and used by the compiler and the
interpreter.</p>
<div class="impl-detail compound">
<p class="compound-first"><strong>CPython implementation detail:</strong> Bytecode is an implementation detail of the CPython interpreter.  No
guarantees are made that bytecode will not be added, removed, or changed
between versions of Python.  Use of this module should not be considered to
work across Python VMs or Python releases.</p>
<div class="compound-last versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>Use 2 bytes for each instruction. Previously the number of bytes varied
by instruction.</p>
</div>
</div>
<p>Example: Given the function <code class="xref py py-func docutils literal notranslate"><span class="pre">myfunc()</span></code>:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">myfunc</span><span class="p">(</span><span class="n">alist</span><span class="p">):</span>
    <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">alist</span><span class="p">)</span>
</pre></div>
</div>
<p>the following command can be used to display the disassembly of
<code class="xref py py-func docutils literal notranslate"><span class="pre">myfunc()</span></code>:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">dis</span><span class="o">.</span><span class="n">dis</span><span class="p">(</span><span class="n">myfunc</span><span class="p">)</span>
<span class="go">  2           0 LOAD_GLOBAL              0 (len)</span>
<span class="go">              2 LOAD_FAST                0 (alist)</span>
<span class="go">              4 CALL_FUNCTION            1</span>
<span class="go">              6 RETURN_VALUE</span>
</pre></div>
</div>
<p>(The “2” is a line number).</p>
<section id="bytecode-analysis">
<h2>Bytecode analysis<a class="headerlink" href="#bytecode-analysis" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4.</span></p>
</div>
<p>The bytecode analysis API allows pieces of Python code to be wrapped in a
<a class="reference internal" href="#dis.Bytecode" title="dis.Bytecode"><code class="xref py py-class docutils literal notranslate"><span class="pre">Bytecode</span></code></a> object that provides easy access to details of the compiled
code.</p>
<dl class="class">
<dt id="dis.Bytecode">
<em class="property">class </em><code class="sig-prename descclassname">dis.</code><code class="sig-name descname">Bytecode</code><span class="sig-paren">(</span><em class="sig-param">x</em>, <em class="sig-param">*</em>, <em class="sig-param">first_line=None</em>, <em class="sig-param">current_offset=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.Bytecode" title="Permalink to this definition">¶</a></dt>
<dd><p>Analyse the bytecode corresponding to a function, generator, asynchronous
generator, coroutine, method, string of source code, or a code object (as
returned by <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a>).</p>
<p>This is a convenience wrapper around many of the functions listed below, most
notably <a class="reference internal" href="#dis.get_instructions" title="dis.get_instructions"><code class="xref py py-func docutils literal notranslate"><span class="pre">get_instructions()</span></code></a>, as iterating over a <a class="reference internal" href="#dis.Bytecode" title="dis.Bytecode"><code class="xref py py-class docutils literal notranslate"><span class="pre">Bytecode</span></code></a>
instance yields the bytecode operations as <a class="reference internal" href="#dis.Instruction" title="dis.Instruction"><code class="xref py py-class docutils literal notranslate"><span class="pre">Instruction</span></code></a> instances.</p>
<p>If <em>first_line</em> is not <code class="docutils literal notranslate"><span class="pre">None</span></code>, it indicates the line number that should be
reported for the first source line in the disassembled code.  Otherwise, the
source line information (if any) is taken directly from the disassembled code
object.</p>
<p>If <em>current_offset</em> is not <code class="docutils literal notranslate"><span class="pre">None</span></code>, it refers to an instruction offset in the
disassembled code. Setting this means <a class="reference internal" href="#dis.Bytecode.dis" title="dis.Bytecode.dis"><code class="xref py py-meth docutils literal notranslate"><span class="pre">dis()</span></code></a> will display a “current
instruction” marker against the specified opcode.</p>
<dl class="method">
<dt id="dis.Bytecode.from_traceback">
<em class="property">classmethod </em><code class="sig-name descname">from_traceback</code><span class="sig-paren">(</span><em class="sig-param">tb</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.Bytecode.from_traceback" title="Permalink to this definition">¶</a></dt>
<dd><p>Construct a <a class="reference internal" href="#dis.Bytecode" title="dis.Bytecode"><code class="xref py py-class docutils literal notranslate"><span class="pre">Bytecode</span></code></a> instance from the given traceback, setting
<em>current_offset</em> to the instruction responsible for the exception.</p>
</dd></dl>

<dl class="data">
<dt id="dis.Bytecode.codeobj">
<code class="sig-name descname">codeobj</code><a class="headerlink" href="#dis.Bytecode.codeobj" title="Permalink to this definition">¶</a></dt>
<dd><p>The compiled code object.</p>
</dd></dl>

<dl class="data">
<dt id="dis.Bytecode.first_line">
<code class="sig-name descname">first_line</code><a class="headerlink" href="#dis.Bytecode.first_line" title="Permalink to this definition">¶</a></dt>
<dd><p>The first source line of the code object (if available)</p>
</dd></dl>

<dl class="method">
<dt id="dis.Bytecode.dis">
<code class="sig-name descname">dis</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#dis.Bytecode.dis" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a formatted view of the bytecode operations (the same as printed by
<a class="reference internal" href="#dis.dis" title="dis.dis"><code class="xref py py-func docutils literal notranslate"><span class="pre">dis.dis()</span></code></a>, but returned as a multi-line string).</p>
</dd></dl>

<dl class="method">
<dt id="dis.Bytecode.info">
<code class="sig-name descname">info</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#dis.Bytecode.info" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a formatted multi-line string with detailed information about the
code object, like <a class="reference internal" href="#dis.code_info" title="dis.code_info"><code class="xref py py-func docutils literal notranslate"><span class="pre">code_info()</span></code></a>.</p>
</dd></dl>

<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>This can now handle coroutine and asynchronous generator objects.</p>
</div>
</dd></dl>

<p>Example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">bytecode</span> <span class="o">=</span> <span class="n">dis</span><span class="o">.</span><span class="n">Bytecode</span><span class="p">(</span><span class="n">myfunc</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">for</span> <span class="n">instr</span> <span class="ow">in</span> <span class="n">bytecode</span><span class="p">:</span>
<span class="gp">... </span>    <span class="nb">print</span><span class="p">(</span><span class="n">instr</span><span class="o">.</span><span class="n">opname</span><span class="p">)</span>
<span class="gp">...</span>
<span class="go">LOAD_GLOBAL</span>
<span class="go">LOAD_FAST</span>
<span class="go">CALL_FUNCTION</span>
<span class="go">RETURN_VALUE</span>
</pre></div>
</div>
</section>
<section id="analysis-functions">
<h2>Analysis functions<a class="headerlink" href="#analysis-functions" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="#module-dis" title="dis: Disassembler for Python bytecode."><code class="xref py py-mod docutils literal notranslate"><span class="pre">dis</span></code></a> module also defines the following analysis functions that convert
the input directly to the desired output. They can be useful if only a single
operation is being performed, so the intermediate analysis object isn’t useful:</p>
<dl class="function">
<dt id="dis.code_info">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">code_info</code><span class="sig-paren">(</span><em class="sig-param">x</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.code_info" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a formatted multi-line string with detailed code object information
for the supplied function, generator, asynchronous generator, coroutine,
method, source code string or code object.</p>
<p>Note that the exact contents of code info strings are highly implementation
dependent and they may change arbitrarily across Python VMs or Python
releases.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>This can now handle coroutine and asynchronous generator objects.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.show_code">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">show_code</code><span class="sig-paren">(</span><em class="sig-param">x</em>, <em class="sig-param">*</em>, <em class="sig-param">file=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.show_code" title="Permalink to this definition">¶</a></dt>
<dd><p>Print detailed code object information for the supplied function, method,
source code string or code object to <em>file</em> (or <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code> if <em>file</em>
is not specified).</p>
<p>This is a convenient shorthand for <code class="docutils literal notranslate"><span class="pre">print(code_info(x),</span> <span class="pre">file=file)</span></code>,
intended for interactive exploration at the interpreter prompt.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.4: </span>Added <em>file</em> parameter.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.dis">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">dis</code><span class="sig-paren">(</span><em class="sig-param">x=None</em>, <em class="sig-param">*</em>, <em class="sig-param">file=None</em>, <em class="sig-param">depth=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.dis" title="Permalink to this definition">¶</a></dt>
<dd><p>Disassemble the <em>x</em> object.  <em>x</em> can denote either a module, a class, a
method, a function, a generator, an asynchronous generator, a coroutine,
a code object, a string of source code or a byte sequence of raw bytecode.
For a module, it disassembles all functions. For a class, it disassembles
all methods (including class and static methods). For a code object or
sequence of raw bytecode, it prints one line per bytecode instruction.
It also recursively disassembles nested code objects (the code of
comprehensions, generator expressions and nested functions, and the code
used for building nested classes).
Strings are first compiled to code objects with the <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a>
built-in function before being disassembled.  If no object is provided, this
function disassembles the last traceback.</p>
<p>The disassembly is written as text to the supplied <em>file</em> argument if
provided and to <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code> otherwise.</p>
<p>The maximal depth of recursion is limited by <em>depth</em> unless it is <code class="docutils literal notranslate"><span class="pre">None</span></code>.
<code class="docutils literal notranslate"><span class="pre">depth=0</span></code> means no recursion.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.4: </span>Added <em>file</em> parameter.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>Implemented recursive disassembling and added <em>depth</em> parameter.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>This can now handle coroutine and asynchronous generator objects.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.distb">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">distb</code><span class="sig-paren">(</span><em class="sig-param">tb=None</em>, <em class="sig-param">*</em>, <em class="sig-param">file=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.distb" title="Permalink to this definition">¶</a></dt>
<dd><p>Disassemble the top-of-stack function of a traceback, using the last
traceback if none was passed.  The instruction causing the exception is
indicated.</p>
<p>The disassembly is written as text to the supplied <em>file</em> argument if
provided and to <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code> otherwise.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.4: </span>Added <em>file</em> parameter.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.disassemble">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">disassemble</code><span class="sig-paren">(</span><em class="sig-param">code</em>, <em class="sig-param">lasti=-1</em>, <em class="sig-param">*</em>, <em class="sig-param">file=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.disassemble" title="Permalink to this definition">¶</a></dt>
<dt id="dis.disco">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">disco</code><span class="sig-paren">(</span><em class="sig-param">code</em>, <em class="sig-param">lasti=-1</em>, <em class="sig-param">*</em>, <em class="sig-param">file=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.disco" title="Permalink to this definition">¶</a></dt>
<dd><p>Disassemble a code object, indicating the last instruction if <em>lasti</em> was
provided.  The output is divided in the following columns:</p>
<ol class="arabic simple">
<li><p>the line number, for the first instruction of each line</p></li>
<li><p>the current instruction, indicated as <code class="docutils literal notranslate"><span class="pre">--&gt;</span></code>,</p></li>
<li><p>a labelled instruction, indicated with <code class="docutils literal notranslate"><span class="pre">&gt;&gt;</span></code>,</p></li>
<li><p>the address of the instruction,</p></li>
<li><p>the operation code name,</p></li>
<li><p>operation parameters, and</p></li>
<li><p>interpretation of the parameters in parentheses.</p></li>
</ol>
<p>The parameter interpretation recognizes local and global variable names,
constant values, branch targets, and compare operators.</p>
<p>The disassembly is written as text to the supplied <em>file</em> argument if
provided and to <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code> otherwise.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.4: </span>Added <em>file</em> parameter.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.get_instructions">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">get_instructions</code><span class="sig-paren">(</span><em class="sig-param">x</em>, <em class="sig-param">*</em>, <em class="sig-param">first_line=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.get_instructions" title="Permalink to this definition">¶</a></dt>
<dd><p>Return an iterator over the instructions in the supplied function, method,
source code string or code object.</p>
<p>The iterator generates a series of <a class="reference internal" href="#dis.Instruction" title="dis.Instruction"><code class="xref py py-class docutils literal notranslate"><span class="pre">Instruction</span></code></a> named tuples giving
the details of each operation in the supplied code.</p>
<p>If <em>first_line</em> is not <code class="docutils literal notranslate"><span class="pre">None</span></code>, it indicates the line number that should be
reported for the first source line in the disassembled code.  Otherwise, the
source line information (if any) is taken directly from the disassembled code
object.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4.</span></p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.findlinestarts">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">findlinestarts</code><span class="sig-paren">(</span><em class="sig-param">code</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.findlinestarts" title="Permalink to this definition">¶</a></dt>
<dd><p>This generator function uses the <code class="docutils literal notranslate"><span class="pre">co_firstlineno</span></code> and <code class="docutils literal notranslate"><span class="pre">co_lnotab</span></code>
attributes of the code object <em>code</em> to find the offsets which are starts of
lines in the source code.  They are generated as <code class="docutils literal notranslate"><span class="pre">(offset,</span> <span class="pre">lineno)</span></code> pairs.
See <a class="reference external" href="https://github.com/python/cpython/tree/3.9/Objects/lnotab_notes.txt">Objects/lnotab_notes.txt</a> for the <code class="docutils literal notranslate"><span class="pre">co_lnotab</span></code> format and
how to decode it.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>Line numbers can be decreasing. Before, they were always increasing.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="dis.findlabels">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">findlabels</code><span class="sig-paren">(</span><em class="sig-param">code</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.findlabels" title="Permalink to this definition">¶</a></dt>
<dd><p>Detect all offsets in the raw compiled bytecode string <em>code</em> which are jump targets, and
return a list of these offsets.</p>
</dd></dl>

<dl class="function">
<dt id="dis.stack_effect">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">stack_effect</code><span class="sig-paren">(</span><em class="sig-param">opcode</em>, <em class="sig-param">oparg=None</em>, <em class="sig-param">*</em>, <em class="sig-param">jump=None</em><span class="sig-paren">)</span><a class="headerlink" href="#dis.stack_effect" title="Permalink to this definition">¶</a></dt>
<dd><p>Compute the stack effect of <em>opcode</em> with argument <em>oparg</em>.</p>
<p>If the code has a jump target and <em>jump</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>, <a class="reference internal" href="#dis.stack_effect" title="dis.stack_effect"><code class="xref py py-func docutils literal notranslate"><span class="pre">stack_effect()</span></code></a>
will return the stack effect of jumping.  If <em>jump</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code>,
it will return the stack effect of not jumping. And if <em>jump</em> is
<code class="docutils literal notranslate"><span class="pre">None</span></code> (default), it will return the maximal stack effect of both cases.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.8: </span>Added <em>jump</em> parameter.</p>
</div>
</dd></dl>

</section>
<section id="python-bytecode-instructions">
<span id="bytecodes"></span><h2>Python Bytecode Instructions<a class="headerlink" href="#python-bytecode-instructions" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="#dis.get_instructions" title="dis.get_instructions"><code class="xref py py-func docutils literal notranslate"><span class="pre">get_instructions()</span></code></a> function and <a class="reference internal" href="#dis.Bytecode" title="dis.Bytecode"><code class="xref py py-class docutils literal notranslate"><span class="pre">Bytecode</span></code></a> class provide
details of bytecode instructions as <a class="reference internal" href="#dis.Instruction" title="dis.Instruction"><code class="xref py py-class docutils literal notranslate"><span class="pre">Instruction</span></code></a> instances:</p>
<dl class="class">
<dt id="dis.Instruction">
<em class="property">class </em><code class="sig-prename descclassname">dis.</code><code class="sig-name descname">Instruction</code><a class="headerlink" href="#dis.Instruction" title="Permalink to this definition">¶</a></dt>
<dd><p>Details for a bytecode operation</p>
<dl class="data">
<dt id="dis.Instruction.opcode">
<code class="sig-name descname">opcode</code><a class="headerlink" href="#dis.Instruction.opcode" title="Permalink to this definition">¶</a></dt>
<dd><p>numeric code for operation, corresponding to the opcode values listed
below and the bytecode values in the <a class="reference internal" href="#opcode-collections"><span class="std std-ref">Opcode collections</span></a>.</p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.opname">
<code class="sig-name descname">opname</code><a class="headerlink" href="#dis.Instruction.opname" title="Permalink to this definition">¶</a></dt>
<dd><p>human readable name for operation</p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.arg">
<code class="sig-name descname">arg</code><a class="headerlink" href="#dis.Instruction.arg" title="Permalink to this definition">¶</a></dt>
<dd><p>numeric argument to operation (if any), otherwise <code class="docutils literal notranslate"><span class="pre">None</span></code></p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.argval">
<code class="sig-name descname">argval</code><a class="headerlink" href="#dis.Instruction.argval" title="Permalink to this definition">¶</a></dt>
<dd><p>resolved arg value (if known), otherwise same as arg</p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.argrepr">
<code class="sig-name descname">argrepr</code><a class="headerlink" href="#dis.Instruction.argrepr" title="Permalink to this definition">¶</a></dt>
<dd><p>human readable description of operation argument</p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.offset">
<code class="sig-name descname">offset</code><a class="headerlink" href="#dis.Instruction.offset" title="Permalink to this definition">¶</a></dt>
<dd><p>start index of operation within bytecode sequence</p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.starts_line">
<code class="sig-name descname">starts_line</code><a class="headerlink" href="#dis.Instruction.starts_line" title="Permalink to this definition">¶</a></dt>
<dd><p>line started by this opcode (if any), otherwise <code class="docutils literal notranslate"><span class="pre">None</span></code></p>
</dd></dl>

<dl class="data">
<dt id="dis.Instruction.is_jump_target">
<code class="sig-name descname">is_jump_target</code><a class="headerlink" href="#dis.Instruction.is_jump_target" title="Permalink to this definition">¶</a></dt>
<dd><p><code class="docutils literal notranslate"><span class="pre">True</span></code> if other code jumps to here, otherwise <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
</dd></dl>

<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4.</span></p>
</div>
</dd></dl>

<p>The Python compiler currently generates the following bytecode instructions.</p>
<p><strong>General instructions</strong></p>
<dl class="opcode">
<dt id="opcode-NOP">
<code class="sig-name descname">NOP</code><a class="headerlink" href="#opcode-NOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Do nothing code.  Used as a placeholder by the bytecode optimizer.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_TOP">
<code class="sig-name descname">POP_TOP</code><a class="headerlink" href="#opcode-POP_TOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes the top-of-stack (TOS) item.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-ROT_TWO">
<code class="sig-name descname">ROT_TWO</code><a class="headerlink" href="#opcode-ROT_TWO" title="Permalink to this definition">¶</a></dt>
<dd><p>Swaps the two top-most stack items.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-ROT_THREE">
<code class="sig-name descname">ROT_THREE</code><a class="headerlink" href="#opcode-ROT_THREE" title="Permalink to this definition">¶</a></dt>
<dd><p>Lifts second and third stack item one position up, moves top down to position
three.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-ROT_FOUR">
<code class="sig-name descname">ROT_FOUR</code><a class="headerlink" href="#opcode-ROT_FOUR" title="Permalink to this definition">¶</a></dt>
<dd><p>Lifts second, third and fourth stack items one position up, moves top down
to position four.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.8.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DUP_TOP">
<code class="sig-name descname">DUP_TOP</code><a class="headerlink" href="#opcode-DUP_TOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Duplicates the reference on top of the stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DUP_TOP_TWO">
<code class="sig-name descname">DUP_TOP_TWO</code><a class="headerlink" href="#opcode-DUP_TOP_TWO" title="Permalink to this definition">¶</a></dt>
<dd><p>Duplicates the two references on top of the stack, leaving them in the
same order.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
</dd></dl>

<p><strong>Unary operations</strong></p>
<p>Unary operations take the top of the stack, apply the operation, and push the
result back on the stack.</p>
<dl class="opcode">
<dt id="opcode-UNARY_POSITIVE">
<code class="sig-name descname">UNARY_POSITIVE</code><a class="headerlink" href="#opcode-UNARY_POSITIVE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">+TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNARY_NEGATIVE">
<code class="sig-name descname">UNARY_NEGATIVE</code><a class="headerlink" href="#opcode-UNARY_NEGATIVE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">-TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNARY_NOT">
<code class="sig-name descname">UNARY_NOT</code><a class="headerlink" href="#opcode-UNARY_NOT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">not</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNARY_INVERT">
<code class="sig-name descname">UNARY_INVERT</code><a class="headerlink" href="#opcode-UNARY_INVERT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">~TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-GET_ITER">
<code class="sig-name descname">GET_ITER</code><a class="headerlink" href="#opcode-GET_ITER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">iter(TOS)</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-GET_YIELD_FROM_ITER">
<code class="sig-name descname">GET_YIELD_FROM_ITER</code><a class="headerlink" href="#opcode-GET_YIELD_FROM_ITER" title="Permalink to this definition">¶</a></dt>
<dd><p>If <code class="docutils literal notranslate"><span class="pre">TOS</span></code> is a <a class="reference internal" href="../glossary.html#term-generator-iterator"><span class="xref std std-term">generator iterator</span></a> or <a class="reference internal" href="../glossary.html#term-coroutine"><span class="xref std std-term">coroutine</span></a> object
it is left as is.  Otherwise, implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">iter(TOS)</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<p><strong>Binary operations</strong></p>
<p>Binary operations remove the top of the stack (TOS) and the second top-most
stack item (TOS1) from the stack.  They perform the operation, and put the
result back on the stack.</p>
<dl class="opcode">
<dt id="opcode-BINARY_POWER">
<code class="sig-name descname">BINARY_POWER</code><a class="headerlink" href="#opcode-BINARY_POWER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">**</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_MULTIPLY">
<code class="sig-name descname">BINARY_MULTIPLY</code><a class="headerlink" href="#opcode-BINARY_MULTIPLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">*</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_MATRIX_MULTIPLY">
<code class="sig-name descname">BINARY_MATRIX_MULTIPLY</code><a class="headerlink" href="#opcode-BINARY_MATRIX_MULTIPLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&#64;</span> <span class="pre">TOS</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_FLOOR_DIVIDE">
<code class="sig-name descname">BINARY_FLOOR_DIVIDE</code><a class="headerlink" href="#opcode-BINARY_FLOOR_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">//</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_TRUE_DIVIDE">
<code class="sig-name descname">BINARY_TRUE_DIVIDE</code><a class="headerlink" href="#opcode-BINARY_TRUE_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">/</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_MODULO">
<code class="sig-name descname">BINARY_MODULO</code><a class="headerlink" href="#opcode-BINARY_MODULO" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">%</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_ADD">
<code class="sig-name descname">BINARY_ADD</code><a class="headerlink" href="#opcode-BINARY_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">+</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_SUBTRACT">
<code class="sig-name descname">BINARY_SUBTRACT</code><a class="headerlink" href="#opcode-BINARY_SUBTRACT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">-</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_SUBSCR">
<code class="sig-name descname">BINARY_SUBSCR</code><a class="headerlink" href="#opcode-BINARY_SUBSCR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1[TOS]</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_LSHIFT">
<code class="sig-name descname">BINARY_LSHIFT</code><a class="headerlink" href="#opcode-BINARY_LSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&lt;&lt;</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_RSHIFT">
<code class="sig-name descname">BINARY_RSHIFT</code><a class="headerlink" href="#opcode-BINARY_RSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&gt;&gt;</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_AND">
<code class="sig-name descname">BINARY_AND</code><a class="headerlink" href="#opcode-BINARY_AND" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&amp;</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_XOR">
<code class="sig-name descname">BINARY_XOR</code><a class="headerlink" href="#opcode-BINARY_XOR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">^</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_OR">
<code class="sig-name descname">BINARY_OR</code><a class="headerlink" href="#opcode-BINARY_OR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">|</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<p><strong>In-place operations</strong></p>
<p>In-place operations are like binary operations, in that they remove TOS and
TOS1, and push the result back on the stack, but the operation is done in-place
when TOS1 supports it, and the resulting TOS may be (but does not have to be)
the original TOS1.</p>
<dl class="opcode">
<dt id="opcode-INPLACE_POWER">
<code class="sig-name descname">INPLACE_POWER</code><a class="headerlink" href="#opcode-INPLACE_POWER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">**</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_MULTIPLY">
<code class="sig-name descname">INPLACE_MULTIPLY</code><a class="headerlink" href="#opcode-INPLACE_MULTIPLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">*</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_MATRIX_MULTIPLY">
<code class="sig-name descname">INPLACE_MATRIX_MULTIPLY</code><a class="headerlink" href="#opcode-INPLACE_MATRIX_MULTIPLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&#64;</span> <span class="pre">TOS</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_FLOOR_DIVIDE">
<code class="sig-name descname">INPLACE_FLOOR_DIVIDE</code><a class="headerlink" href="#opcode-INPLACE_FLOOR_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">//</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_TRUE_DIVIDE">
<code class="sig-name descname">INPLACE_TRUE_DIVIDE</code><a class="headerlink" href="#opcode-INPLACE_TRUE_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">/</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_MODULO">
<code class="sig-name descname">INPLACE_MODULO</code><a class="headerlink" href="#opcode-INPLACE_MODULO" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">%</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_ADD">
<code class="sig-name descname">INPLACE_ADD</code><a class="headerlink" href="#opcode-INPLACE_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">+</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_SUBTRACT">
<code class="sig-name descname">INPLACE_SUBTRACT</code><a class="headerlink" href="#opcode-INPLACE_SUBTRACT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">-</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_LSHIFT">
<code class="sig-name descname">INPLACE_LSHIFT</code><a class="headerlink" href="#opcode-INPLACE_LSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&lt;&lt;</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_RSHIFT">
<code class="sig-name descname">INPLACE_RSHIFT</code><a class="headerlink" href="#opcode-INPLACE_RSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&gt;&gt;</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_AND">
<code class="sig-name descname">INPLACE_AND</code><a class="headerlink" href="#opcode-INPLACE_AND" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&amp;</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_XOR">
<code class="sig-name descname">INPLACE_XOR</code><a class="headerlink" href="#opcode-INPLACE_XOR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">^</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_OR">
<code class="sig-name descname">INPLACE_OR</code><a class="headerlink" href="#opcode-INPLACE_OR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">|</span> <span class="pre">TOS</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_SUBSCR">
<code class="sig-name descname">STORE_SUBSCR</code><a class="headerlink" href="#opcode-STORE_SUBSCR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS1[TOS]</span> <span class="pre">=</span> <span class="pre">TOS2</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_SUBSCR">
<code class="sig-name descname">DELETE_SUBSCR</code><a class="headerlink" href="#opcode-DELETE_SUBSCR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">del</span> <span class="pre">TOS1[TOS]</span></code>.</p>
</dd></dl>

<p><strong>Coroutine opcodes</strong></p>
<dl class="opcode">
<dt id="opcode-GET_AWAITABLE">
<code class="sig-name descname">GET_AWAITABLE</code><a class="headerlink" href="#opcode-GET_AWAITABLE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">get_awaitable(TOS)</span></code>, where <code class="docutils literal notranslate"><span class="pre">get_awaitable(o)</span></code>
returns <code class="docutils literal notranslate"><span class="pre">o</span></code> if <code class="docutils literal notranslate"><span class="pre">o</span></code> is a coroutine object or a generator object with
the CO_ITERABLE_COROUTINE flag, or resolves
<code class="docutils literal notranslate"><span class="pre">o.__await__</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-GET_AITER">
<code class="sig-name descname">GET_AITER</code><a class="headerlink" href="#opcode-GET_AITER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS.__aiter__()</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>Returning awaitable objects from <code class="docutils literal notranslate"><span class="pre">__aiter__</span></code> is no longer
supported.</p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-GET_ANEXT">
<code class="sig-name descname">GET_ANEXT</code><a class="headerlink" href="#opcode-GET_ANEXT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">PUSH(get_awaitable(TOS.__anext__()))</span></code>.  See <code class="docutils literal notranslate"><span class="pre">GET_AWAITABLE</span></code>
for details about <code class="docutils literal notranslate"><span class="pre">get_awaitable</span></code></p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-END_ASYNC_FOR">
<code class="sig-name descname">END_ASYNC_FOR</code><a class="headerlink" href="#opcode-END_ASYNC_FOR" title="Permalink to this definition">¶</a></dt>
<dd><p>Terminates an <a class="reference internal" href="../reference/compound_stmts.html#async-for"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">async</span> <span class="pre">for</span></code></a> loop.  Handles an exception raised
when awaiting a next item.  If TOS is <a class="reference internal" href="exceptions.html#StopAsyncIteration" title="StopAsyncIteration"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StopAsyncIteration</span></code></a> pop 7
values from the stack and restore the exception state using the second
three of them.  Otherwise re-raise the exception using the three values
from the stack.  An exception handler block is removed from the block stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.8.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BEFORE_ASYNC_WITH">
<code class="sig-name descname">BEFORE_ASYNC_WITH</code><a class="headerlink" href="#opcode-BEFORE_ASYNC_WITH" title="Permalink to this definition">¶</a></dt>
<dd><p>Resolves <code class="docutils literal notranslate"><span class="pre">__aenter__</span></code> and <code class="docutils literal notranslate"><span class="pre">__aexit__</span></code> from the object on top of the
stack.  Pushes <code class="docutils literal notranslate"><span class="pre">__aexit__</span></code> and result of <code class="docutils literal notranslate"><span class="pre">__aenter__()</span></code> to the stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_ASYNC_WITH">
<code class="sig-name descname">SETUP_ASYNC_WITH</code><a class="headerlink" href="#opcode-SETUP_ASYNC_WITH" title="Permalink to this definition">¶</a></dt>
<dd><p>Creates a new frame object.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>

<p><strong>Miscellaneous opcodes</strong></p>
<dl class="opcode">
<dt id="opcode-PRINT_EXPR">
<code class="sig-name descname">PRINT_EXPR</code><a class="headerlink" href="#opcode-PRINT_EXPR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements the expression statement for the interactive mode.  TOS is removed
from the stack and printed.  In non-interactive mode, an expression statement
is terminated with <a class="reference internal" href="#opcode-POP_TOP"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">POP_TOP</span></code></a>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SET_ADD">
<code class="sig-name descname">SET_ADD</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-SET_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <code class="docutils literal notranslate"><span class="pre">set.add(TOS1[-i],</span> <span class="pre">TOS)</span></code>.  Used to implement set comprehensions.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LIST_APPEND">
<code class="sig-name descname">LIST_APPEND</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LIST_APPEND" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <code class="docutils literal notranslate"><span class="pre">list.append(TOS1[-i],</span> <span class="pre">TOS)</span></code>.  Used to implement list comprehensions.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-MAP_ADD">
<code class="sig-name descname">MAP_ADD</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-MAP_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <code class="docutils literal notranslate"><span class="pre">dict.__setitem__(TOS1[-i],</span> <span class="pre">TOS1,</span> <span class="pre">TOS)</span></code>.  Used to implement dict
comprehensions.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.8: </span>Map value is TOS and map key is TOS1. Before, those were reversed.</p>
</div>
</dd></dl>

<p>For all of the <a class="reference internal" href="#opcode-SET_ADD"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">SET_ADD</span></code></a>, <a class="reference internal" href="#opcode-LIST_APPEND"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">LIST_APPEND</span></code></a> and <a class="reference internal" href="#opcode-MAP_ADD"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">MAP_ADD</span></code></a>
instructions, while the added value or key/value pair is popped off, the
container object remains on the stack so that it is available for further
iterations of the loop.</p>
<dl class="opcode">
<dt id="opcode-RETURN_VALUE">
<code class="sig-name descname">RETURN_VALUE</code><a class="headerlink" href="#opcode-RETURN_VALUE" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns with TOS to the caller of the function.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-YIELD_VALUE">
<code class="sig-name descname">YIELD_VALUE</code><a class="headerlink" href="#opcode-YIELD_VALUE" title="Permalink to this definition">¶</a></dt>
<dd><p>Pops TOS and yields it from a <a class="reference internal" href="../glossary.html#term-generator"><span class="xref std std-term">generator</span></a>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-YIELD_FROM">
<code class="sig-name descname">YIELD_FROM</code><a class="headerlink" href="#opcode-YIELD_FROM" title="Permalink to this definition">¶</a></dt>
<dd><p>Pops TOS and delegates to it as a subiterator from a <a class="reference internal" href="../glossary.html#term-generator"><span class="xref std std-term">generator</span></a>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.3.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_ANNOTATIONS">
<code class="sig-name descname">SETUP_ANNOTATIONS</code><a class="headerlink" href="#opcode-SETUP_ANNOTATIONS" title="Permalink to this definition">¶</a></dt>
<dd><p>Checks whether <code class="docutils literal notranslate"><span class="pre">__annotations__</span></code> is defined in <code class="docutils literal notranslate"><span class="pre">locals()</span></code>, if not it is
set up to an empty <code class="docutils literal notranslate"><span class="pre">dict</span></code>. This opcode is only emitted if a class
or module body contains <a class="reference internal" href="../glossary.html#term-variable-annotation"><span class="xref std std-term">variable annotations</span></a>
statically.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IMPORT_STAR">
<code class="sig-name descname">IMPORT_STAR</code><a class="headerlink" href="#opcode-IMPORT_STAR" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads all symbols not starting with <code class="docutils literal notranslate"><span class="pre">'_'</span></code> directly from the module TOS to
the local namespace. The module is popped after loading all names. This
opcode implements <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">module</span> <span class="pre">import</span> <span class="pre">*</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_BLOCK">
<code class="sig-name descname">POP_BLOCK</code><a class="headerlink" href="#opcode-POP_BLOCK" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes one block from the block stack.  Per frame, there is a stack of
blocks, denoting <a class="reference internal" href="../reference/compound_stmts.html#try"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">try</span></code></a> statements, and such.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_EXCEPT">
<code class="sig-name descname">POP_EXCEPT</code><a class="headerlink" href="#opcode-POP_EXCEPT" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes one block from the block stack. The popped block must be an exception
handler block, as implicitly created when entering an except handler.  In
addition to popping extraneous values from the frame stack, the last three
popped values are used to restore the exception state.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-RERAISE">
<code class="sig-name descname">RERAISE</code><a class="headerlink" href="#opcode-RERAISE" title="Permalink to this definition">¶</a></dt>
<dd><p>Re-raises the exception currently on top of the stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-WITH_EXCEPT_START">
<code class="sig-name descname">WITH_EXCEPT_START</code><a class="headerlink" href="#opcode-WITH_EXCEPT_START" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls the function in position 7 on the stack with the top three
items on the stack as arguments.
Used to implement the call <code class="docutils literal notranslate"><span class="pre">context_manager.__exit__(*exc_info())</span></code> when an exception
has occurred in a <a class="reference internal" href="../reference/compound_stmts.html#with"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">with</span></code></a> statement.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_ASSERTION_ERROR">
<code class="sig-name descname">LOAD_ASSERTION_ERROR</code><a class="headerlink" href="#opcode-LOAD_ASSERTION_ERROR" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes <a class="reference internal" href="exceptions.html#AssertionError" title="AssertionError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">AssertionError</span></code></a> onto the stack.  Used by the <a class="reference internal" href="../reference/simple_stmts.html#assert"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">assert</span></code></a>
statement.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_BUILD_CLASS">
<code class="sig-name descname">LOAD_BUILD_CLASS</code><a class="headerlink" href="#opcode-LOAD_BUILD_CLASS" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes <code class="xref py py-func docutils literal notranslate"><span class="pre">builtins.__build_class__()</span></code> onto the stack.  It is later called
by <a class="reference internal" href="#opcode-CALL_FUNCTION"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">CALL_FUNCTION</span></code></a> to construct a class.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_WITH">
<code class="sig-name descname">SETUP_WITH</code><span class="sig-paren">(</span><em class="sig-param">delta</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-SETUP_WITH" title="Permalink to this definition">¶</a></dt>
<dd><p>This opcode performs several operations before a with block starts.  First,
it loads <a class="reference internal" href="../reference/datamodel.html#object.__exit__" title="object.__exit__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__exit__()</span></code></a> from the context manager and pushes it onto
the stack for later use by <code class="xref std std-opcode docutils literal notranslate"><span class="pre">WITH_CLEANUP_START</span></code>.  Then,
<a class="reference internal" href="../reference/datamodel.html#object.__enter__" title="object.__enter__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__enter__()</span></code></a> is called, and a finally block pointing to <em>delta</em>
is pushed.  Finally, the result of calling the <code class="docutils literal notranslate"><span class="pre">__enter__()</span></code> method is pushed onto
the stack.  The next opcode will either ignore it (<a class="reference internal" href="#opcode-POP_TOP"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">POP_TOP</span></code></a>), or
store it in (a) variable(s) (<a class="reference internal" href="#opcode-STORE_FAST"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_FAST</span></code></a>, <a class="reference internal" href="#opcode-STORE_NAME"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_NAME</span></code></a>, or
<a class="reference internal" href="#opcode-UNPACK_SEQUENCE"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">UNPACK_SEQUENCE</span></code></a>).</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
</dd></dl>

<p>All of the following opcodes use their arguments.</p>
<dl class="opcode">
<dt id="opcode-STORE_NAME">
<code class="sig-name descname">STORE_NAME</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-STORE_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">name</span> <span class="pre">=</span> <span class="pre">TOS</span></code>. <em>namei</em> is the index of <em>name</em> in the attribute
<code class="xref py py-attr docutils literal notranslate"><span class="pre">co_names</span></code> of the code object. The compiler tries to use
<a class="reference internal" href="#opcode-STORE_FAST"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_FAST</span></code></a> or <a class="reference internal" href="#opcode-STORE_GLOBAL"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_GLOBAL</span></code></a> if possible.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_NAME">
<code class="sig-name descname">DELETE_NAME</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-DELETE_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">del</span> <span class="pre">name</span></code>, where <em>namei</em> is the index into <code class="xref py py-attr docutils literal notranslate"><span class="pre">co_names</span></code>
attribute of the code object.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNPACK_SEQUENCE">
<code class="sig-name descname">UNPACK_SEQUENCE</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-UNPACK_SEQUENCE" title="Permalink to this definition">¶</a></dt>
<dd><p>Unpacks TOS into <em>count</em> individual values, which are put onto the stack
right-to-left.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNPACK_EX">
<code class="sig-name descname">UNPACK_EX</code><span class="sig-paren">(</span><em class="sig-param">counts</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-UNPACK_EX" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements assignment with a starred target: Unpacks an iterable in TOS into
individual values, where the total number of values can be smaller than the
number of items in the iterable: one of the new values will be a list of all
leftover items.</p>
<p>The low byte of <em>counts</em> is the number of values before the list value, the
high byte of <em>counts</em> the number of values after it.  The resulting values
are put onto the stack right-to-left.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_ATTR">
<code class="sig-name descname">STORE_ATTR</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-STORE_ATTR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">TOS.name</span> <span class="pre">=</span> <span class="pre">TOS1</span></code>, where <em>namei</em> is the index of name in
<code class="xref py py-attr docutils literal notranslate"><span class="pre">co_names</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_ATTR">
<code class="sig-name descname">DELETE_ATTR</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-DELETE_ATTR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <code class="docutils literal notranslate"><span class="pre">del</span> <span class="pre">TOS.name</span></code>, using <em>namei</em> as index into <code class="xref py py-attr docutils literal notranslate"><span class="pre">co_names</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_GLOBAL">
<code class="sig-name descname">STORE_GLOBAL</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-STORE_GLOBAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <a class="reference internal" href="#opcode-STORE_NAME"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_NAME</span></code></a>, but stores the name as a global.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_GLOBAL">
<code class="sig-name descname">DELETE_GLOBAL</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-DELETE_GLOBAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <a class="reference internal" href="#opcode-DELETE_NAME"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">DELETE_NAME</span></code></a>, but deletes a global name.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_CONST">
<code class="sig-name descname">LOAD_CONST</code><span class="sig-paren">(</span><em class="sig-param">consti</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_CONST" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes <code class="docutils literal notranslate"><span class="pre">co_consts[consti]</span></code> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_NAME">
<code class="sig-name descname">LOAD_NAME</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes the value associated with <code class="docutils literal notranslate"><span class="pre">co_names[namei]</span></code> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_TUPLE">
<code class="sig-name descname">BUILD_TUPLE</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_TUPLE" title="Permalink to this definition">¶</a></dt>
<dd><p>Creates a tuple consuming <em>count</em> items from the stack, and pushes the
resulting tuple onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_LIST">
<code class="sig-name descname">BUILD_LIST</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_LIST" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <a class="reference internal" href="#opcode-BUILD_TUPLE"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">BUILD_TUPLE</span></code></a>, but creates a list.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_SET">
<code class="sig-name descname">BUILD_SET</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_SET" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <a class="reference internal" href="#opcode-BUILD_TUPLE"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">BUILD_TUPLE</span></code></a>, but creates a set.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_MAP">
<code class="sig-name descname">BUILD_MAP</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_MAP" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a new dictionary object onto the stack.  Pops <code class="docutils literal notranslate"><span class="pre">2</span> <span class="pre">*</span> <span class="pre">count</span></code> items
so that the dictionary holds <em>count</em> entries:
<code class="docutils literal notranslate"><span class="pre">{...,</span> <span class="pre">TOS3:</span> <span class="pre">TOS2,</span> <span class="pre">TOS1:</span> <span class="pre">TOS}</span></code>.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>The dictionary is created from stack items instead of creating an
empty dictionary pre-sized to hold <em>count</em> items.</p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_CONST_KEY_MAP">
<code class="sig-name descname">BUILD_CONST_KEY_MAP</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_CONST_KEY_MAP" title="Permalink to this definition">¶</a></dt>
<dd><p>The version of <a class="reference internal" href="#opcode-BUILD_MAP"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">BUILD_MAP</span></code></a> specialized for constant keys. Pops the
top element on the stack which contains a tuple of keys, then starting from
<code class="docutils literal notranslate"><span class="pre">TOS1</span></code>, pops <em>count</em> values to form values in the built dictionary.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_STRING">
<code class="sig-name descname">BUILD_STRING</code><span class="sig-paren">(</span><em class="sig-param">count</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_STRING" title="Permalink to this definition">¶</a></dt>
<dd><p>Concatenates <em>count</em> strings from the stack and pushes the resulting string
onto the stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LIST_TO_TUPLE">
<code class="sig-name descname">LIST_TO_TUPLE</code><a class="headerlink" href="#opcode-LIST_TO_TUPLE" title="Permalink to this definition">¶</a></dt>
<dd><p>Pops a list from the stack and pushes a tuple containing the same values.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LIST_EXTEND">
<code class="sig-name descname">LIST_EXTEND</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LIST_EXTEND" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <code class="docutils literal notranslate"><span class="pre">list.extend(TOS1[-i],</span> <span class="pre">TOS)</span></code>.  Used to build lists.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SET_UPDATE">
<code class="sig-name descname">SET_UPDATE</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-SET_UPDATE" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <code class="docutils literal notranslate"><span class="pre">set.update(TOS1[-i],</span> <span class="pre">TOS)</span></code>.  Used to build sets.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DICT_UPDATE">
<code class="sig-name descname">DICT_UPDATE</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-DICT_UPDATE" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <code class="docutils literal notranslate"><span class="pre">dict.update(TOS1[-i],</span> <span class="pre">TOS)</span></code>.  Used to build dicts.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DICT_MERGE">
<code class="sig-name descname">DICT_MERGE</code><a class="headerlink" href="#opcode-DICT_MERGE" title="Permalink to this definition">¶</a></dt>
<dd><p>Like <a class="reference internal" href="#opcode-DICT_UPDATE"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">DICT_UPDATE</span></code></a> but raises an exception for duplicate keys.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_ATTR">
<code class="sig-name descname">LOAD_ATTR</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_ATTR" title="Permalink to this definition">¶</a></dt>
<dd><p>Replaces TOS with <code class="docutils literal notranslate"><span class="pre">getattr(TOS,</span> <span class="pre">co_names[namei])</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-COMPARE_OP">
<code class="sig-name descname">COMPARE_OP</code><span class="sig-paren">(</span><em class="sig-param">opname</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-COMPARE_OP" title="Permalink to this definition">¶</a></dt>
<dd><p>Performs a Boolean operation.  The operation name can be found in
<code class="docutils literal notranslate"><span class="pre">cmp_op[opname]</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IS_OP">
<code class="sig-name descname">IS_OP</code><span class="sig-paren">(</span><em class="sig-param">invert</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-IS_OP" title="Permalink to this definition">¶</a></dt>
<dd><p>Performs <code class="docutils literal notranslate"><span class="pre">is</span></code> comparison, or <code class="docutils literal notranslate"><span class="pre">is</span> <span class="pre">not</span></code> if <code class="docutils literal notranslate"><span class="pre">invert</span></code> is 1.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CONTAINS_OP">
<code class="sig-name descname">CONTAINS_OP</code><span class="sig-paren">(</span><em class="sig-param">invert</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-CONTAINS_OP" title="Permalink to this definition">¶</a></dt>
<dd><p>Performs <code class="docutils literal notranslate"><span class="pre">in</span></code> comparison, or <code class="docutils literal notranslate"><span class="pre">not</span> <span class="pre">in</span></code> if <code class="docutils literal notranslate"><span class="pre">invert</span></code> is 1.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IMPORT_NAME">
<code class="sig-name descname">IMPORT_NAME</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-IMPORT_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Imports the module <code class="docutils literal notranslate"><span class="pre">co_names[namei]</span></code>.  TOS and TOS1 are popped and provide
the <em>fromlist</em> and <em>level</em> arguments of <a class="reference internal" href="functions.html#__import__" title="__import__"><code class="xref py py-func docutils literal notranslate"><span class="pre">__import__()</span></code></a>.  The module
object is pushed onto the stack.  The current namespace is not affected: for
a proper import statement, a subsequent <a class="reference internal" href="#opcode-STORE_FAST"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_FAST</span></code></a> instruction
modifies the namespace.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IMPORT_FROM">
<code class="sig-name descname">IMPORT_FROM</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-IMPORT_FROM" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads the attribute <code class="docutils literal notranslate"><span class="pre">co_names[namei]</span></code> from the module found in TOS. The
resulting object is pushed onto the stack, to be subsequently stored by a
<a class="reference internal" href="#opcode-STORE_FAST"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">STORE_FAST</span></code></a> instruction.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_FORWARD">
<code class="sig-name descname">JUMP_FORWARD</code><span class="sig-paren">(</span><em class="sig-param">delta</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-JUMP_FORWARD" title="Permalink to this definition">¶</a></dt>
<dd><p>Increments bytecode counter by <em>delta</em>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_JUMP_IF_TRUE">
<code class="sig-name descname">POP_JUMP_IF_TRUE</code><span class="sig-paren">(</span><em class="sig-param">target</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-POP_JUMP_IF_TRUE" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is true, sets the bytecode counter to <em>target</em>.  TOS is popped.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_JUMP_IF_FALSE">
<code class="sig-name descname">POP_JUMP_IF_FALSE</code><span class="sig-paren">(</span><em class="sig-param">target</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-POP_JUMP_IF_FALSE" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is false, sets the bytecode counter to <em>target</em>.  TOS is popped.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_IF_NOT_EXC_MATCH">
<code class="sig-name descname">JUMP_IF_NOT_EXC_MATCH</code><span class="sig-paren">(</span><em class="sig-param">target</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-JUMP_IF_NOT_EXC_MATCH" title="Permalink to this definition">¶</a></dt>
<dd><p>Tests whether the second value on the stack is an exception matching TOS,
and jumps if it is not. Pops two values from the stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.9.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_IF_TRUE_OR_POP">
<code class="sig-name descname">JUMP_IF_TRUE_OR_POP</code><span class="sig-paren">(</span><em class="sig-param">target</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-JUMP_IF_TRUE_OR_POP" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is true, sets the bytecode counter to <em>target</em> and leaves TOS on the
stack.  Otherwise (TOS is false), TOS is popped.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_IF_FALSE_OR_POP">
<code class="sig-name descname">JUMP_IF_FALSE_OR_POP</code><span class="sig-paren">(</span><em class="sig-param">target</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-JUMP_IF_FALSE_OR_POP" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is false, sets the bytecode counter to <em>target</em> and leaves TOS on the
stack.  Otherwise (TOS is true), TOS is popped.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.1.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_ABSOLUTE">
<code class="sig-name descname">JUMP_ABSOLUTE</code><span class="sig-paren">(</span><em class="sig-param">target</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-JUMP_ABSOLUTE" title="Permalink to this definition">¶</a></dt>
<dd><p>Set bytecode counter to <em>target</em>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-FOR_ITER">
<code class="sig-name descname">FOR_ITER</code><span class="sig-paren">(</span><em class="sig-param">delta</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-FOR_ITER" title="Permalink to this definition">¶</a></dt>
<dd><p>TOS is an <a class="reference internal" href="../glossary.html#term-iterator"><span class="xref std std-term">iterator</span></a>.  Call its <a class="reference internal" href="stdtypes.html#iterator.__next__" title="iterator.__next__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__next__()</span></code></a> method.  If
this yields a new value, push it on the stack (leaving the iterator below
it).  If the iterator indicates it is exhausted, TOS is popped, and the byte
code counter is incremented by <em>delta</em>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_GLOBAL">
<code class="sig-name descname">LOAD_GLOBAL</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_GLOBAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads the global named <code class="docutils literal notranslate"><span class="pre">co_names[namei]</span></code> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_FINALLY">
<code class="sig-name descname">SETUP_FINALLY</code><span class="sig-paren">(</span><em class="sig-param">delta</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-SETUP_FINALLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a try block from a try-finally or try-except clause onto the block
stack.  <em>delta</em> points to the finally block or the first except block.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_FAST">
<code class="sig-name descname">LOAD_FAST</code><span class="sig-paren">(</span><em class="sig-param">var_num</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_FAST" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a reference to the local <code class="docutils literal notranslate"><span class="pre">co_varnames[var_num]</span></code> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_FAST">
<code class="sig-name descname">STORE_FAST</code><span class="sig-paren">(</span><em class="sig-param">var_num</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-STORE_FAST" title="Permalink to this definition">¶</a></dt>
<dd><p>Stores TOS into the local <code class="docutils literal notranslate"><span class="pre">co_varnames[var_num]</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_FAST">
<code class="sig-name descname">DELETE_FAST</code><span class="sig-paren">(</span><em class="sig-param">var_num</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-DELETE_FAST" title="Permalink to this definition">¶</a></dt>
<dd><p>Deletes local <code class="docutils literal notranslate"><span class="pre">co_varnames[var_num]</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_CLOSURE">
<code class="sig-name descname">LOAD_CLOSURE</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_CLOSURE" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a reference to the cell contained in slot <em>i</em> of the cell and free
variable storage.  The name of the variable is <code class="docutils literal notranslate"><span class="pre">co_cellvars[i]</span></code> if <em>i</em> is
less than the length of <em>co_cellvars</em>.  Otherwise it is <code class="docutils literal notranslate"><span class="pre">co_freevars[i</span> <span class="pre">-</span>
<span class="pre">len(co_cellvars)]</span></code>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_DEREF">
<code class="sig-name descname">LOAD_DEREF</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_DEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads the cell contained in slot <em>i</em> of the cell and free variable storage.
Pushes a reference to the object the cell contains on the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_CLASSDEREF">
<code class="sig-name descname">LOAD_CLASSDEREF</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_CLASSDEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Much like <a class="reference internal" href="#opcode-LOAD_DEREF"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">LOAD_DEREF</span></code></a> but first checks the locals dictionary before
consulting the cell.  This is used for loading free variables in class
bodies.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_DEREF">
<code class="sig-name descname">STORE_DEREF</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-STORE_DEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Stores TOS into the cell contained in slot <em>i</em> of the cell and free variable
storage.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_DEREF">
<code class="sig-name descname">DELETE_DEREF</code><span class="sig-paren">(</span><em class="sig-param">i</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-DELETE_DEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Empties the cell contained in slot <em>i</em> of the cell and free variable storage.
Used by the <a class="reference internal" href="../reference/simple_stmts.html#del"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">del</span></code></a> statement.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-RAISE_VARARGS">
<code class="sig-name descname">RAISE_VARARGS</code><span class="sig-paren">(</span><em class="sig-param">argc</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-RAISE_VARARGS" title="Permalink to this definition">¶</a></dt>
<dd><p>Raises an exception using one of the 3 forms of the <code class="docutils literal notranslate"><span class="pre">raise</span></code> statement,
depending on the value of <em>argc</em>:</p>
<ul class="simple">
<li><p>0: <code class="docutils literal notranslate"><span class="pre">raise</span></code> (re-raise previous exception)</p></li>
<li><p>1: <code class="docutils literal notranslate"><span class="pre">raise</span> <span class="pre">TOS</span></code> (raise exception instance or type at <code class="docutils literal notranslate"><span class="pre">TOS</span></code>)</p></li>
<li><p>2: <code class="docutils literal notranslate"><span class="pre">raise</span> <span class="pre">TOS1</span> <span class="pre">from</span> <span class="pre">TOS</span></code> (raise exception instance or type at <code class="docutils literal notranslate"><span class="pre">TOS1</span></code>
with <code class="docutils literal notranslate"><span class="pre">__cause__</span></code> set to <code class="docutils literal notranslate"><span class="pre">TOS</span></code>)</p></li>
</ul>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION">
<code class="sig-name descname">CALL_FUNCTION</code><span class="sig-paren">(</span><em class="sig-param">argc</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-CALL_FUNCTION" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a callable object with positional arguments.
<em>argc</em> indicates the number of positional arguments.
The top of the stack contains positional arguments, with the right-most
argument on top.  Below the arguments is a callable object to call.
<code class="docutils literal notranslate"><span class="pre">CALL_FUNCTION</span></code> pops all arguments and the callable object off the stack,
calls the callable object with those arguments, and pushes the return value
returned by the callable object.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>This opcode is used only for calls with positional arguments.</p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION_KW">
<code class="sig-name descname">CALL_FUNCTION_KW</code><span class="sig-paren">(</span><em class="sig-param">argc</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-CALL_FUNCTION_KW" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a callable object with positional (if any) and keyword arguments.
<em>argc</em> indicates the total number of positional and keyword arguments.
The top element on the stack contains a tuple with the names of the
keyword arguments, which must be strings.
Below that are the values for the keyword arguments,
in the order corresponding to the tuple.
Below that are positional arguments, with the right-most parameter on
top.  Below the arguments is a callable object to call.
<code class="docutils literal notranslate"><span class="pre">CALL_FUNCTION_KW</span></code> pops all arguments and the callable object off the stack,
calls the callable object with those arguments, and pushes the return value
returned by the callable object.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>Keyword arguments are packed in a tuple instead of a dictionary,
<em>argc</em> indicates the total number of arguments.</p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION_EX">
<code class="sig-name descname">CALL_FUNCTION_EX</code><span class="sig-paren">(</span><em class="sig-param">flags</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-CALL_FUNCTION_EX" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a callable object with variable set of positional and keyword
arguments.  If the lowest bit of <em>flags</em> is set, the top of the stack
contains a mapping object containing additional keyword arguments.
Before the callable is called, the mapping object and iterable object
are each “unpacked” and their contents passed in as keyword and
positional arguments respectively.
<code class="docutils literal notranslate"><span class="pre">CALL_FUNCTION_EX</span></code> pops all arguments and the callable object off the stack,
calls the callable object with those arguments, and pushes the return value
returned by the callable object.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_METHOD">
<code class="sig-name descname">LOAD_METHOD</code><span class="sig-paren">(</span><em class="sig-param">namei</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-LOAD_METHOD" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads a method named <code class="docutils literal notranslate"><span class="pre">co_names[namei]</span></code> from the TOS object. TOS is popped.
This bytecode distinguishes two cases: if TOS has a method with the correct
name, the bytecode pushes the unbound method and TOS. TOS will be used as
the first argument (<code class="docutils literal notranslate"><span class="pre">self</span></code>) by <a class="reference internal" href="#opcode-CALL_METHOD"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">CALL_METHOD</span></code></a> when calling the
unbound method. Otherwise, <code class="docutils literal notranslate"><span class="pre">NULL</span></code> and the object return by the attribute
lookup are pushed.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.7.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_METHOD">
<code class="sig-name descname">CALL_METHOD</code><span class="sig-paren">(</span><em class="sig-param">argc</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-CALL_METHOD" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a method.  <em>argc</em> is the number of positional arguments.
Keyword arguments are not supported.  This opcode is designed to be used
with <a class="reference internal" href="#opcode-LOAD_METHOD"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">LOAD_METHOD</span></code></a>.  Positional arguments are on top of the stack.
Below them, the two items described in <a class="reference internal" href="#opcode-LOAD_METHOD"><code class="xref std std-opcode docutils literal notranslate"><span class="pre">LOAD_METHOD</span></code></a> are on the
stack (either <code class="docutils literal notranslate"><span class="pre">self</span></code> and an unbound method object or <code class="docutils literal notranslate"><span class="pre">NULL</span></code> and an
arbitrary callable). All of them are popped and the return value is pushed.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.7.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-MAKE_FUNCTION">
<code class="sig-name descname">MAKE_FUNCTION</code><span class="sig-paren">(</span><em class="sig-param">flags</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-MAKE_FUNCTION" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a new function object on the stack.  From bottom to top, the consumed
stack must consist of values if the argument carries a specified flag value</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">0x01</span></code> a tuple of default values for positional-only and
positional-or-keyword parameters in positional order</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">0x02</span></code> a dictionary of keyword-only parameters’ default values</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">0x04</span></code> an annotation dictionary</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">0x08</span></code> a tuple containing cells for free variables, making a closure</p></li>
<li><p>the code associated with the function (at TOS1)</p></li>
<li><p>the <a class="reference internal" href="../glossary.html#term-qualified-name"><span class="xref std std-term">qualified name</span></a> of the function (at TOS)</p></li>
</ul>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_SLICE">
<code class="sig-name descname">BUILD_SLICE</code><span class="sig-paren">(</span><em class="sig-param">argc</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-BUILD_SLICE" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-0">Pushes a slice object on the stack.  <em>argc</em> must be 2 or 3.  If it is 2,
<code class="docutils literal notranslate"><span class="pre">slice(TOS1,</span> <span class="pre">TOS)</span></code> is pushed; if it is 3, <code class="docutils literal notranslate"><span class="pre">slice(TOS2,</span> <span class="pre">TOS1,</span> <span class="pre">TOS)</span></code> is
pushed. See the <a class="reference internal" href="functions.html#slice" title="slice"><code class="xref py py-func docutils literal notranslate"><span class="pre">slice()</span></code></a> built-in function for more information.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-EXTENDED_ARG">
<code class="sig-name descname">EXTENDED_ARG</code><span class="sig-paren">(</span><em class="sig-param">ext</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-EXTENDED_ARG" title="Permalink to this definition">¶</a></dt>
<dd><p>Prefixes any opcode which has an argument too big to fit into the default one
byte. <em>ext</em> holds an additional byte which act as higher bits in the argument.
For each opcode, at most three prefixal <code class="docutils literal notranslate"><span class="pre">EXTENDED_ARG</span></code> are allowed, forming
an argument from two-byte to four-byte.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-FORMAT_VALUE">
<code class="sig-name descname">FORMAT_VALUE</code><span class="sig-paren">(</span><em class="sig-param">flags</em><span class="sig-paren">)</span><a class="headerlink" href="#opcode-FORMAT_VALUE" title="Permalink to this definition">¶</a></dt>
<dd><p>Used for implementing formatted literal strings (f-strings).  Pops
an optional <em>fmt_spec</em> from the stack, then a required <em>value</em>.
<em>flags</em> is interpreted as follows:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">(flags</span> <span class="pre">&amp;</span> <span class="pre">0x03)</span> <span class="pre">==</span> <span class="pre">0x00</span></code>: <em>value</em> is formatted as-is.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">(flags</span> <span class="pre">&amp;</span> <span class="pre">0x03)</span> <span class="pre">==</span> <span class="pre">0x01</span></code>: call <a class="reference internal" href="stdtypes.html#str" title="str"><code class="xref py py-func docutils literal notranslate"><span class="pre">str()</span></code></a> on <em>value</em> before
formatting it.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">(flags</span> <span class="pre">&amp;</span> <span class="pre">0x03)</span> <span class="pre">==</span> <span class="pre">0x02</span></code>: call <a class="reference internal" href="functions.html#repr" title="repr"><code class="xref py py-func docutils literal notranslate"><span class="pre">repr()</span></code></a> on <em>value</em> before
formatting it.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">(flags</span> <span class="pre">&amp;</span> <span class="pre">0x03)</span> <span class="pre">==</span> <span class="pre">0x03</span></code>: call <a class="reference internal" href="functions.html#ascii" title="ascii"><code class="xref py py-func docutils literal notranslate"><span class="pre">ascii()</span></code></a> on <em>value</em> before
formatting it.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">(flags</span> <span class="pre">&amp;</span> <span class="pre">0x04)</span> <span class="pre">==</span> <span class="pre">0x04</span></code>: pop <em>fmt_spec</em> from the stack and use
it, else use an empty <em>fmt_spec</em>.</p></li>
</ul>
<p>Formatting is performed using <code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_Format()</span></code>.  The
result is pushed on the stack.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>

<dl class="opcode">
<dt id="opcode-HAVE_ARGUMENT">
<code class="sig-name descname">HAVE_ARGUMENT</code><a class="headerlink" href="#opcode-HAVE_ARGUMENT" title="Permalink to this definition">¶</a></dt>
<dd><p>This is not really an opcode.  It identifies the dividing line between
opcodes which don’t use their argument and those that do
(<code class="docutils literal notranslate"><span class="pre">&lt;</span> <span class="pre">HAVE_ARGUMENT</span></code> and <code class="docutils literal notranslate"><span class="pre">&gt;=</span> <span class="pre">HAVE_ARGUMENT</span></code>, respectively).</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>Now every instruction has an argument, but opcodes <code class="docutils literal notranslate"><span class="pre">&lt;</span> <span class="pre">HAVE_ARGUMENT</span></code>
ignore it. Before, only opcodes <code class="docutils literal notranslate"><span class="pre">&gt;=</span> <span class="pre">HAVE_ARGUMENT</span></code> had an argument.</p>
</div>
</dd></dl>

</section>
<section id="opcode-collections">
<span id="id1"></span><h2>Opcode collections<a class="headerlink" href="#opcode-collections" title="Permalink to this headline">¶</a></h2>
<p>These collections are provided for automatic introspection of bytecode
instructions:</p>
<dl class="data">
<dt id="dis.opname">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">opname</code><a class="headerlink" href="#dis.opname" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of operation names, indexable using the bytecode.</p>
</dd></dl>

<dl class="data">
<dt id="dis.opmap">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">opmap</code><a class="headerlink" href="#dis.opmap" title="Permalink to this definition">¶</a></dt>
<dd><p>Dictionary mapping operation names to bytecodes.</p>
</dd></dl>

<dl class="data">
<dt id="dis.cmp_op">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">cmp_op</code><a class="headerlink" href="#dis.cmp_op" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of all compare operation names.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasconst">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">hasconst</code><a class="headerlink" href="#dis.hasconst" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access a constant.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasfree">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">hasfree</code><a class="headerlink" href="#dis.hasfree" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access a free variable (note that ‘free’ in this
context refers to names in the current scope that are referenced by inner
scopes or names in outer scopes that are referenced from this scope.  It does
<em>not</em> include references to global or builtin scopes).</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasname">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">hasname</code><a class="headerlink" href="#dis.hasname" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access an attribute by name.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasjrel">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">hasjrel</code><a class="headerlink" href="#dis.hasjrel" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that have a relative jump target.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasjabs">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">hasjabs</code><a class="headerlink" href="#dis.hasjabs" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that have an absolute jump target.</p>
</dd></dl>

<dl class="data">
<dt id="dis.haslocal">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">haslocal</code><a class="headerlink" href="#dis.haslocal" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access a local variable.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hascompare">
<code class="sig-prename descclassname">dis.</code><code class="sig-name descname">hascompare</code><a class="headerlink" href="#dis.hascompare" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes of Boolean operations.</p>
</dd></dl>

</section>
</section>


          </div>
        </div>
      </div>
      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
        <div class="sphinxsidebarwrapper">
  <h3><a href="../contents.html">Table of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">dis</span></code> — Disassembler for Python bytecode</a><ul>
<li><a class="reference internal" href="#bytecode-analysis">Bytecode analysis</a></li>
<li><a class="reference internal" href="#analysis-functions">Analysis functions</a></li>
<li><a class="reference internal" href="#python-bytecode-instructions">Python Bytecode Instructions</a></li>
<li><a class="reference internal" href="#opcode-collections">Opcode collections</a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
  <p class="topless"><a href="compileall.html"
                        title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">compileall</span></code> — Byte-compile Python libraries</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="pickletools.html"
                        title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickletools</span></code> — Tools for pickle developers</a></p>
  <div role="note" aria-label="source link">
    <h3>This Page</h3>
    <ul class="this-page-menu">
      <li><a href="../bugs.html">Report a Bug</a></li>
      <li>
        <a href="https://github.com/python/cpython/blob/3.9/Doc/library/dis.rst"
            rel="nofollow">Show Source
        </a>
      </li>
    </ul>
  </div>
        </div>
      </div>
      <div class="clearer"></div>
    </div>  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="pickletools.html" title="pickletools — Tools for pickle developers"
             >next</a> |</li>
        <li class="right" >
          <a href="compileall.html" title="compileall — Byte-compile Python libraries"
             >previous</a> |</li>

    <li><img src="../_static/py.png" alt=""
             style="vertical-align: middle; margin-top: -1px"/></li>
    <li><a href="https://www.python.org/">Python</a> &#187;</li>
    

    <li>
      <a href="../index.html">3.9.6 Documentation</a> &#187;
    </li>

          <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="language.html" >Python Language Services</a> &#187;</li>
    <li class="right">
        

    <div class="inline-search" style="display: none" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="Quick search" type="text" name="q" />
          <input type="submit" value="Go" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
    <script type="text/javascript">$('.inline-search').show(0);</script>
         |
    </li>

      </ul>
    </div>  
    <div class="footer">
    &copy; <a href="../copyright.html">Copyright</a> 2001-2021, Python Software Foundation.
    <br />

    The Python Software Foundation is a non-profit corporation.
<a href="https://www.python.org/psf/donations/">Please donate.</a>
<br />
    <br />

    Last updated on Jun 28, 2021.
    <a href="https://docs.python.org/3/bugs.html">Found a bug</a>?
    <br />

    Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 2.3.1.
    </div>

  </body>
</html>